/**
* @brief Particle tracing with caching
*/
static trace_t PTL_Trace (ptl_t* ptl, const AABB& aabb)
{
static ptlTraceCache_t ptlCache;
const float epsilonPos = 3.0f;
const float epsilonBBox = 1.0f;
if (VectorCompareEps(ptlCache.start, ptl->origin, epsilonPos) && VectorCompareEps(ptlCache.end, ptl->s, epsilonPos)
&& VectorCompareEps(ptlCache.pBox.mins, aabb.mins, epsilonBBox) && VectorCompareEps(ptlCache.pBox.maxs, aabb.maxs, epsilonBBox)) {
ptlCache.count++;
return ptlCache.trace;
}
VectorCopy(ptl->origin, ptlCache.start);
VectorCopy(ptl->s, ptlCache.end);
ptlCache.pBox.set(aabb);
ptlCache.trace = CL_Trace(Line(ptl->origin, ptl->s), aabb, nullptr, nullptr, MASK_SOLID, cl.mapMaxLevel - 1);
return ptlCache.trace;
}
/**
* @brief Particle tracing with caching
*/
static inline trace_t PTL_Trace (ptl_t *ptl, const vec3_t mins, const vec3_t maxs)
{
static ptlTraceCache_t ptlCache;
const float epsilonPos = 3.0f;
const float epsilonBBox = 1.0f;
if (VectorCompareEps(ptlCache.start, ptl->origin, epsilonPos) && VectorCompareEps(ptlCache.end, ptl->s, epsilonPos)
&& VectorCompareEps(ptlCache.mins, mins, epsilonBBox) && VectorCompareEps(ptlCache.maxs, maxs, epsilonBBox)) {
ptlCache.count++;
return ptlCache.trace;
}
VectorCopy(ptl->origin, ptlCache.start);
VectorCopy(ptl->s, ptlCache.end);
VectorCopy(mins, ptlCache.mins);
VectorCopy(maxs, ptlCache.maxs);
ptlCache.trace = CL_Trace(ptl->origin, ptl->s, AABB(mins, maxs), nullptr, nullptr, MASK_SOLID, cl.mapMaxLevel - 1);
return ptlCache.trace;
}
static void LE_PlayFootStepSound (le_t* le)
{
if (Q_strvalid(le->teamDef->footstepSound)) {
S_LoadAndPlaySample(le->teamDef->footstepSound, le->origin, SOUND_ATTN_NORM, SND_VOLUME_FOOTSTEPS);
return;
}
/* walking in water will not play the normal footstep sounds */
if (!le->pathContents[le->pathPos]) {
vec3_t from, to;
/* prepare trace vectors */
PosToVec(le->pos, from);
VectorCopy(from, to);
/* we should really hit the ground with this */
to[2] -= UNIT_HEIGHT;
const trace_t trace = CL_Trace(Line(from, to), AABB::EMPTY, nullptr, nullptr, MASK_SOLID, cl_worldlevel->integer);
if (trace.surface)
LE_PlaySoundFileAndParticleForSurface(le, trace.surface->name);
} else
LE_PlaySoundFileForContents(le, le->pathContents[le->pathPos]);
}
/*
===============
CL_AddParticles
===============
*/
void CL_AddParticles (void)
{
cparticle_t *p, *next;
float alpha;
float time, time2;
vec3_t org;
int color;
cparticle_t *active, *tail;
int contents;
float grav;
active = NULL;
tail = NULL;
if (!cl_drawParticles->integer)
return;
// allow gravity tweaks by the server
grav = Cvar_VariableValue("sv_gravity");
if (!grav)
grav = 1;
else
grav /= 800;
for (p = active_particles; p; p = next)
{
next = p->next;
// set alpha
// PMM - added INSTANT_PARTICLE handling
if (p->alphavel != INSTANT_PARTICLE)
{
time = (cl.time - p->time) * 0.001;
alpha = p->alpha + time * p->alphavel;
if (alpha <= 0)
{
// faded out
CL_FreeParticle (p);
continue;
}
else if (alpha <= 0.3f && p->color == 240) // this is HACK central...
{
// do blood decals
if (rand() & 4)
{
trace_t tr;
time2 = time * time;
org[0] = p->org[0] + p->vel[0] * time + p->accel[0] * time2;
org[1] = p->org[1] + p->vel[1] * time + p->accel[1] * time2;
org[2] = p->org[2] + p->vel[2] * time + p->accel[2] * time2;
tr = CL_Trace(p->org, org, 0, MASK_SOLID);
if (tr.fraction != 1.0f)
{
if (!VectorCompare(tr.plane.normal, vec3_origin) && !(CM_PointContents(p->org, 0) & MASK_WATER)) // no blood splatters underwater...
{
vec4_t color;
Vector4Set(color, 1.0, 0.0, 0.0, 1.0f);
RE_AddDecal(tr.endpos, tr.plane.normal, color, 16 + ((rand() % 21 * 0.05f) - 0.5f), DECAL_BLOOD + (rand() & 4), 0, frand() * 360);
}
}
}
}
}
else
{
alpha = p->alpha;
}
if (alpha > 1.0)
alpha = 1;
// set color
color = p->color;
// backup old position
VectorCopy (p->org, p->oldOrg);
// calculate new position
time2 = time * time;
org[0] = p->org[0] + p->vel[0] * time + p->accel[0] * time2;
org[1] = p->org[1] + p->vel[1] * time + p->accel[1] * time2;
org[2] = p->org[2] + p->vel[2] * time + p->accel[2] * time2;
// gravity modulation
//if (!p->ignoreGrav)
// org[2] += time2 * -PARTICLE_GRAVITY;
// collision test
if (cl_particleCollision->integer)
{
if (p->bounceFactor)
{
trace_t trace;
vec3_t vel;
int hitTime;
float time;
trace = CL_Trace(p->oldOrg, org, 0, CONTENTS_SOLID);
if (trace.fraction > 0 && trace.fraction < 1)
{
// reflect the velocity on the trace plane
hitTime = cl.time - cls.rframetime + cls.rframetime * trace.fraction;
time = ((float)hitTime - p->time) * 0.001;
Vector3Set (vel, p->vel[0], p->vel[1], p->vel[2] + p->accel[2] * time * grav);
VectorReflect (vel, trace.plane.normal, p->vel);
VectorScale (p->vel, p->bounceFactor, p->vel);
// check for stop, making sure that even on low FPS systems it doesn't bobble
if (trace.allsolid || (trace.plane.normal[2] > 0 && (p->vel[2] < 40 || p->vel[2] < -cls.rframetime * p->vel[2])))
{
VectorClear(p->vel);
VectorClear(p->accel);
p->bounceFactor = 0.0f;
}
VectorCopy (trace.endpos, org);
// reset particle
p->time = cl.time;
VectorCopy (org, p->org);
}
}
}
// kill all particles in solid
contents = CM_PointContents (org, 0);
if (contents & MASK_SOLID)
{
CL_FreeParticle (p);
continue;
}
// have this always below CL_FreeParticle(p); !
p->next = NULL;
if (!tail)
{
active = tail = p;
}
else
{
tail->next = p;
tail = p;
}
// add to scene
V_AddParticle (org, color, alpha);
// PMM
if (p->alphavel == INSTANT_PARTICLE)
{
p->alphavel = 0.0;
p->alpha = 0.0;
}
}
active_particles = active;
}
/*
=================
RE_AddDecal
Adds a single decal to the decal list
=================
*/
void RE_GL_AddDecal (vec3_t origin, vec3_t dir, vec4_t color, float size, int type, int flags, float angle)
{
int i, j, numfragments;
vec3_t verts[MAX_DECAL_VERTS], shade, temp;
markFragment_t *fr, fragments[MAX_FRAGMENTS_PER_DECAL];
vec3_t axis[3];
cdecal_t *d;
float lightspot[3];
if (!gl_decals->value)
return;
// invalid decal size
if (size <= 0)
return;
// a hack to produce decals from explosions etc
if (VectorCompare(dir, vec3_origin))
{
float scale = 1.5 * size;
trace_t trace;
vec3_t end, dirs[6] = {
{ 1.0, 0.0, 0.0 },
{ -1.0, 0.0, 0.0 },
{ 0.0, 1.0, 0.0 },
{ 0.0, -1.0, 0.0 },
{ 0.0, 0.0, 1.0 },
{ 0.0, 0.0, -1.0 }
};
for (i = 0; i < 6; i++)
{
VectorMA(origin, scale, dirs[i], end);
trace = CL_Trace(origin, end, 0, MASK_SOLID);
if (trace.fraction != 1.0)
RE_GL_AddDecal(origin, trace.plane.normal, color, size, type, flags, angle);
}
return;
}
// calculate orientation matrix
VectorNormalize2(dir, axis[0]);
PerpendicularVector(axis[1], axis[0]);
RotatePointAroundVector(axis[2], axis[0], axis[1], angle);
CrossProduct(axis[0], axis[2], axis[1]);
// clip it against the world
numfragments = R_GetClippedFragments(origin, axis, size, MAX_DECAL_VERTS, verts, MAX_FRAGMENTS_PER_DECAL, fragments);
if (!numfragments)
return; // no valid fragments
// store out vertex data
size = 0.5f / size;
VectorScale(axis[1], size, axis[1]);
VectorScale(axis[2], size, axis[2]);
for (i = 0, fr = fragments; i < numfragments; i++, fr++)
{
// check if we have hit the max
if (fr->numPoints > MAX_DECAL_VERTS)
fr->numPoints = MAX_DECAL_VERTS;
else if (fr->numPoints <= 0)
continue;
d = R_AllocDecal();
d->time = r_newrefdef.time;
d->node = fr->node;
VectorCopy(fr->surf->plane->normal, d->direction);
if (!(fr->surf->flags & SURF_PLANEBACK))
VectorNegate(d->direction, d->direction); // reverse direction
Vector4Set(d->color, color[0], color[1], color[2], color[3]);
VectorCopy(origin, d->org);
//if (flags & DF_SHADE)
{
R_LightPoint(origin, shade, lightspot);
for (j = 0; j < 3; j++)
d->color[j] = (d->color[j] * shade[j] * 0.6) + (d->color[j] * 0.4);
}
d->type = type;
d->flags = flags;
// make the decal vert
d->numverts = fr->numPoints;
for (j = 0; j < fr->numPoints && j < MAX_VERTS_PER_FRAGMENT; j++)
{
// xyz
VectorCopy(verts[fr->firstPoint + j], d->verts[j]);
// st
VectorSubtract(d->verts[j], origin, temp);
d->stcoords[j][0] = DotProduct(temp, axis[1]) + 0.5f;
d->stcoords[j][1] = DotProduct(temp, axis[2]) + 0.5f;
}
}
}
/**
* @brief Updates weather for the time passed; handles particle creation/removal automatically
*/
void Weather::update (int milliseconds)
{
/* Don't play the weather particles if the user doesn't want them */
if (!Cvar_GetInteger("cl_particleweather")) {
/* This makes weather look very weird if it is enabled mid-battle */
/* clearParticles(); */
return;
}
size_t dead = 0;
/* physics: check for ttl and move live particles */
for (size_t i = 0; i < Weather::MAX_PARTICLES; i++) {
Weather::particle &prt = particles[i];
if (prt.ttl < 0) {
dead++;
continue;
} else { /** @todo creates vanishing-before-impact particles at low framerates -- should improve that somehow */
int restOfLife = prt.ttl -= milliseconds;
if (restOfLife < 0) {
if (fabs(prt.vz) < 0.001f || splashTime < 1) {
/* either no splash or is a splash particle dying */
dead++;
continue;
}
/* convert it into splash particle */
/* technically, we should complete the last frame of movement, but with current particle types it looks good even without it */
prt.vz = 0; prt.vx = 0; prt.vy = 0;
prt.ttl += splashTime;
}
}
/* if we got so far, particle is alive and probably needs a physics update */
const int timeAfterUpdate = prt.timeout -= milliseconds;
const float moveDuration = milliseconds * 0.001f;
prt.x += prt.vx * moveDuration; prt.y += prt.vy * moveDuration; prt.z += prt.vz * moveDuration;
if (timeAfterUpdate > 0) {
/* just move linearly */
continue;
}
/* alter motion vector */
/** @todo */
}
/* create new ones in place of dead */
if (dead) {
const float windX = cos(windDirection) * (windStrength + crand() * windTurbulence);
const float windY = sin(windDirection) * (windStrength + crand() * windTurbulence);
AABB weatherZone; /** < extents of zone in which weather particles will be rendered */
weatherZone = cl.mapData->mapBox;
weatherZone.expandXY(256);
weatherZone.maxs[2] += 512;
Line prtPath;
if (dead > 200) dead = 200; /* avoid creating too much particles in the single frame, it could kill the low-end hardware */
int debugCreated = 0;
for (size_t i = 0; dead && i < Weather::MAX_PARTICLES && i < weatherStrength * Weather::MAX_PARTICLES; i++) {
Weather::particle &prt = particles[i];
if (prt.ttl >= 0)
continue;
prt.x = (frand() * (weatherZone.getMaxX() - weatherZone.getMinX())) + weatherZone.getMinX();
prt.y = (frand() * (weatherZone.getMaxY() - weatherZone.getMinY())) + weatherZone.getMinY();
prt.z = weatherZone.getMaxZ();
prt.vx = windX;
prt.vy = windY;
prt.vz = -fallingSpeed * (frand() * 0.2f + 0.9f);
float lifeTime = (weatherZone.getMaxZ() - weatherZone.getMinZ()) / -prt.vz; /* default */
VectorSet(prtPath.start, prt.x, prt.y, prt.z);
VectorSet(prtPath.stop, prt.x + prt.vx * lifeTime, prt.y + prt.vy * lifeTime, prt.z + prt.vz * lifeTime);
trace_t trace = CL_Trace(prtPath, AABB::EMPTY, nullptr, nullptr, MASK_SOLID, cl.mapMaxLevel - 1); /* find the collision point */
lifeTime *= trace.fraction;
prt.ttl = 1000 * lifeTime; /* convert to milliseconds */
prt.timeout = prt.ttl + 1000000; /** @todo proper code for physics */
debugCreated++;
dead--;
}
}
#if 0
if (debugCreated) Com_Printf("created %i weather particles\n", debugCreated);
#endif
}